From 89486e14996e6955991e3caf2c72c70570f0b9d8 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Thu, 24 Mar 2011 15:16:56 -0400
Subject: [PATCH] creating a gtkgl DrawingArea and drawing a quad

---
 Window.py | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 96 insertions(+), 1 deletion(-)

diff --git a/Window.py b/Window.py
index d60da30..7290361 100644
--- a/Window.py
+++ b/Window.py
@@ -1,12 +1,33 @@
 
 import gtk
+import gtk.gtkgl
+
+from OpenGL.GL import *
 
 class Window:
     def __init__(self, title):
         self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
         self.window.set_title(title)
         self.window.connect("destroy", self.destroy_event)
-        self.window.add(gtk.Label('Hello World'))
+
+        try:
+            # try double-buffered
+            self.glconfig = gtk.gdkgl.Config(mode = (gtk.gdkgl.MODE_RGB |
+                                              gtk.gdkgl.MODE_DOUBLE |
+                                              gtk.gdkgl.MODE_DEPTH))
+        except gtk.gdkgl.NoMatches:
+            # try single-buffered
+            self.glconfig = gtk.gdkgl.Config(mode = (gtk.gdkgl.MODE_RGB |
+                                              gtk.gdkgl.MODE_DEPTH))
+
+        glarea = gtk.gtkgl.DrawingArea(self.glconfig)
+        glarea.set_size_request(300, 300)
+
+        glarea.connect_after('realize', self.init)
+        glarea.connect('configure_event', self.reshape)
+        glarea.connect('expose_event', self.draw)
+
+        self.window.add(glarea)
         self.window.show_all()
 
     def main(self):
@@ -14,3 +35,77 @@ class Window:
 
     def destroy_event(self, widget, data=None):
         gtk.main_quit()
+
+    def init(self, glarea):
+        # get GLContext and GLDrawable
+        glcontext = glarea.get_gl_context()
+        gldrawable = glarea.get_gl_drawable()
+
+        # GL calls
+        if not gldrawable.gl_begin(glcontext): return
+
+        glLightfv(GL_LIGHT0, GL_POSITION, (1, 1, 1, 0))
+        glEnable(GL_CULL_FACE)
+        glEnable(GL_LIGHTING)
+        glEnable(GL_LIGHT0)
+        glEnable(GL_DEPTH_TEST)
+
+        gldrawable.gl_end()
+
+    def reshape(self, glarea, event):
+        # get GLContext and GLDrawable
+        glcontext = glarea.get_gl_context()
+        gldrawable = glarea.get_gl_drawable()
+
+        # GL calls
+        if not gldrawable.gl_begin(glcontext): return
+
+        x, y, width, height = glarea.get_allocation()
+
+        glViewport(0, 0, width, height)
+        glMatrixMode(GL_PROJECTION)
+        glLoadIdentity()
+        if width > height:
+            w = float(width) / float(height)
+            glFrustum(-w, w, -1.0, 1.0, 5.0, 60.0)
+        else:
+            h = float(height) / float(width)
+            glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0)
+
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+        glTranslatef(0.0, 0.0, -40.0)
+
+        gldrawable.gl_end()
+
+        return True
+
+    def draw(self, glarea, event):
+        # get GLContext and GLDrawable
+        glcontext = glarea.get_gl_context()
+        gldrawable = glarea.get_gl_drawable()
+
+        # GL calls
+        if not gldrawable.gl_begin(glcontext): return
+
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+
+        glPushMatrix()
+        glTranslatef(-3.0, -2.0, -5.0)
+        glBegin(GL_QUADS)
+        glNormal(0, 0, 1)
+        glVertex(0, 0, 0)
+        glVertex(1, 0, 0)
+        glVertex(1, 1, 0)
+        glVertex(0, 1, 0)
+        glEnd()
+        glPopMatrix()
+
+        if gldrawable.is_double_buffered():
+            gldrawable.swap_buffers()
+        else:
+            glFlush()
+
+        gldrawable.gl_end()
+
+        return True